385319509 has 2 divisors, whose sum is σ = 385319510. Its totient is φ = 385319508.

The previous prime is 385319461. The next prime is 385319527. The reversal of 385319509 is 905913583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 283248900 + 102070609 = 16830^2 + 10103^2 .

It is an emirp because it is prime and its reverse (905913583) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385319509 is a prime.

It is a super-2 number, since 2×385319509² = 296942248032002162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385319609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192659754 + 192659755.

It is an arithmetic number, because the mean of its divisors is an integer number (192659755).

Almost surely, 2^385319509 is an apocalyptic number.

It is an amenable number.

385319509 is a deficient number, since it is larger than the sum of its proper divisors (1).

385319509 is an equidigital number, since it uses as much as digits as its factorization.

385319509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 385319509 is about 19629.5570250579. The cubic root of 385319509 is about 727.6798224997.

The spelling of 385319509 in words is "three hundred eighty-five million, three hundred nineteen thousand, five hundred nine".